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发表于 2007-6-14 16:37:06
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我认为EMC不一定需要和LVD同样的分开来测试。
EMC指令和LVD指令有不一样的地方,适用的对象。
LVD指令的对象"electrical equipment"定义"‘electrical equipment’means any equipment designed for use with a voltage rating of between 50 and 1 000 V for alternating current and between 75 and 1 500 V for direct current";
EMC指令的对象"Equipment"定义"‘equipment’ means any apparatus or fixed installation" 以及 "‘apparatus’ means any finished appliance or combination thereof made commercially available as a single functional unit, intended for the end user and liable to generate electromagnetic disturbance, or the performance of which is liable to be affected by such disturbance。这个定义是从整体考虑的。
现在有一个adapter和一个main device组成的系统,以LVD指令是可以分解成两个有rating的equipment,一个rating在LVD scope之内,而另一个不在scope之内;然而以EMC指令的角度,是应该作为一个 finished combination来对待,而不能分解。
我认为新LVD指令增加的rating scope不包括<50AC,<75DC的设备,等于是认可这样的设备是安全的,从这个角度上讲,基于安全的adapter和安全的main device,再对整体做safety验证就不是很有必要了。 |
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